Open-source alternatives to Curl

FileCentipede is a comprehensive file management and transfer application designed to handle diverse network protocols and data operations. It functions as a multi-protocol download manager, a full-featured BitTorrent client, and a remote filesystem manager, providing a unified interface for moving and organizing data across local and remote environments. The application distinguishes itself through deep browser integration, which allows for the direct capture of media streams, video, and bulk download links from web pages. It also includes a modular utility suite that enables users to perfor

This project is a comprehensive Python network request framework designed for both synchronous and asynchronous HTTP communication. It provides a high-performance client capable of executing non-blocking requests within event-driven applications, while also supporting standard blocking calls for simpler scripts. The library is built to operate natively across diverse asynchronous runtimes, automatically detecting and utilizing the underlying event loop for concurrency. What distinguishes this library is its modular architecture, which decouples request construction from network execution thro

libhv is a high-performance C/C++ network library and event-driven I/O framework used to build TCP, UDP, SSL, HTTP, WebSocket, and MQTT clients and servers. It provides a non-blocking event loop for managing network sockets, timers, and system signals across multiple threads. The project is distinguished by its integrated support for specialized network roles, including a full HTTP web server with RESTful routing and middleware, an MQTT messaging client for IoT communication, and the ability to implement SOCKS5 and HTTP proxies. It also features a reliable UDP implementation to ensure ordered

This library is a high-level networking tool for the Rust programming language, designed to execute HTTP requests and interact with remote services and REST APIs. It provides both asynchronous and blocking interfaces, allowing developers to send data using formats such as JSON or multipart forms while maintaining type-safe communication with external web services. The library distinguishes itself through a comprehensive architecture that manages network sessions and data flow. It utilizes connection pooling to maintain persistent sockets, which reduces latency during consecutive requests to t

Axios is an isomorphic, promise-based HTTP client designed for making asynchronous network requests across different JavaScript execution environments, including the browser and Node.js. It functions as a JSON API client that serializes JavaScript objects into JSON and parses server responses into structured data. The project features a system for managing reusable client instances with shared configurations, such as base URLs and default settings. It includes a mechanism for intercepting outgoing requests and incoming responses globally, allowing data to be transformed before it reaches the

grpcurl is a command-line interface and client tool for invoking gRPC methods and inspecting service definitions. It serves as a server debugger and reflection client, allowing users to call remote procedures and verify server responses from the terminal using JSON or protobuf formats. The tool distinguishes itself through the ability to discover available services and methods dynamically via a server reflection service or by loading local protobuf schema files. It can extract service descriptions from a server for local use and print specific schema symbol definitions. It covers a broad ran

This project is a comprehensive resource directory for web data extraction, providing a curated collection of tools and libraries for parsing data, automating browsers, and managing network operations. It serves as a guide for extracting structured information from HTML, XML, JSON, and PDF formats. The toolkit focuses on advanced data collection strategies, including headless browser automation to interact with JavaScript and a suite of network utilities for DNS resolution and WebSocket connections. It specifically covers methods for bypassing bot protections through proxy pool management, us

Quarkus is a Kubernetes-native Java framework designed for building high-performance, memory-efficient applications. It utilizes ahead-of-time native compilation to transform Java code into standalone, optimized binaries that eliminate the need for a virtual machine, enabling rapid startup and reduced memory consumption. By performing code augmentation during the build phase, it shifts heavy processing tasks away from runtime, ensuring that applications are optimized for cloud-native environments. The framework distinguishes itself through a unified approach to reactive and imperative program

This project is a memory-safe implementation of the QUIC transport protocol and HTTP/3, designed for high-throughput and efficient network communication. It provides a comprehensive toolkit for building secure, low-latency network applications by managing the full lifecycle of transport connections, including protocol negotiation, stream data exchange, and connection state management. The library distinguishes itself through a focus on performance and protocol integrity. It utilizes a formal state machine to enforce strict adherence to transport rules and employs zero-copy buffer management t

Superagent is an isomorphic JavaScript HTTP client for sending network requests and processing responses across both Node.js and web browser environments. It provides a fluent request builder that uses a chainable interface to construct complex network requests with custom headers, query strings, and bodies. The library functions as a runtime-agnostic request adapter, allowing a single codebase to work consistently across different environments. It includes specialized capabilities such as an HTTP/2 client for forcing the HTTP/2 protocol and a Node.js agent for managing Unix socket connection

node-fetch is a promise-based HTTP client library that provides a lightweight implementation of the Fetch API for the Node.js runtime. It serves as a network interface for performing asynchronous HTTP requests, handling server communication, and managing headers. The library utilizes a promise-based request lifecycle to wrap network calls, ensuring asynchronous behavior. It incorporates stream-based handling for both requests and responses to process large payloads efficiently without overloading system memory. Its capabilities cover a broad range of network communication tasks, including th

Goutte is a PHP web scraper and DOM crawler designed for extracting data from websites. It functions as an HTTP client wrapper that enables the retrieval of web pages and the parsing of HTML content. The project provides a web form automator to programmatically fill and submit HTML forms to remote servers. It also includes a mechanism for automated website crawling by following links to discover and archive web content. The system supports stateful session management to maintain cookies and headers across requests. It further covers HTML data extraction through DOM-based element selection an

Feign is a declarative Java HTTP client framework that maps method signatures to REST API requests. It functions as an HTTP interface mapper, allowing the creation of type-safe clients by defining service interfaces with annotations to eliminate manual request logic. The framework features a pluggable HTTP transport layer, which decouples request definition from execution by routing network traffic through interchangeable underlying HTTP engines. It provides a comprehensive request management pipeline including interceptors for modifying headers, policy-driven retry logic for failure recover

This project is a community-driven directory of software resources, libraries, and tools designed to support iOS application development. It serves as a centralized reference point for developers, organizing a vast ecosystem of third-party components into a searchable, structured index to facilitate discovery and project integration. The repository distinguishes itself through its collaborative curation model, which aggregates disparate utilities into a single, maintainable catalog. By leveraging a flat-file documentation structure, it provides a clear overview of the tools available for nati

This project provides a collection of practical implementations and code references for establishing secure network communications using transport layer security protocols. It serves as a guide for developers to implement public key infrastructure and enforce encryption standards within client and server applications. The repository focuses on cryptographic certificate management, including the generation of public and private key pairs and the creation of self-signed certificates for local testing environments. It covers the configuration of secure web servers, offering methods to harden ser

This is a non-blocking network client for Java applications that provides asynchronous HTTP request capabilities and bidirectional WebSocket connectivity. It leverages a Netty-based architecture to handle high volumes of network input and output. The library utilizes native transport abstractions such as Epoll, KQueue, and io_uring to reduce system latency. It supports HTTP/2 multiplexing to run multiple concurrent request-response streams over a single connection and provides automatic response body decompression for various formats. Core capabilities cover the management of complex network

rustls is a memory-safe implementation of the Transport Layer Security protocol written in Rust. It provides a cryptographic stack for secure network communication, supporting both TLS 1.3 and 1.2 standards for client and server implementations. The project is designed as a modular cryptographic library that allows swapping underlying cryptographic backends and primitive providers to meet specific security or performance requirements. It incorporates a post-quantum cryptography stack, utilizing hybrid key exchanges and signatures to protect data against future quantum computing threats. The

This framework provides a functional architecture for building interactive command-line applications. It utilizes a reactive runtime engine that synchronizes application state, user input, and visual output through a central event-driven message loop. By employing a unidirectional data flow pattern, the framework separates the definition of application state from the logic that processes updates and the declarative rendering process that transforms state into terminal-ready output. The framework distinguishes itself through its approach to side-effect management and terminal environment adapt

This project is a high-performance implementation of the QUIC transport protocol, providing a library for establishing multiplexed, low-latency network connections over UDP. It serves as a foundational networking stack for building modern web servers and clients, with native support for HTTP/3 and WebTransport standards. The library distinguishes itself through advanced connection management, including the ability to maintain stable sessions across changing network paths or IP addresses using connection identifiers. It optimizes data throughput by employing packet batching to reduce kernel ov

NATS Server is a high-performance, lightweight messaging system designed for cloud-native applications, edge computing, and distributed microservices. It functions as a distributed publish-subscribe broker that routes messages using hierarchical, dot-separated subject strings, enabling decoupled communication between services without requiring centralized broker lookups. The system supports core messaging patterns including asynchronous publish-subscribe, request-reply, and load-balanced queue processing. The platform distinguishes itself through a decentralized architecture that eliminates t

HTTPie is a command-line HTTP client and REST API debugger used for sending requests to web services. It functions as a network tool for managing headers, authentication sessions, and file uploads, with a specific focus on the transmission and reception of JSON data. The tool utilizes a custom parsing layer to translate simplified command-line input into structured HTTP parameters. It provides ANSI-based terminal formatting to apply color and structural indentation to raw responses, improving human readability for web debugging. The project covers request construction and previewing, multipa

HTTPie is a command-line HTTP client designed for sending requests to web services and APIs. It functions as a terminal-based web client and JSON API interface, allowing users to interact with RESTful services and download remote files directly from the console. The tool simplifies the interaction with APIs through a custom syntax for argument parsing and automatic JSON payload serialization. It includes a request debugger to verify the structure of a request before transmission and uses ANSI-based formatting to display server responses with color and indentation for improved readability. Th

This project is a comprehensive, community-curated directory that organizes a vast landscape of Python software libraries, frameworks, and tools. It serves as a centralized knowledge base designed to facilitate ecosystem navigation and accelerate developer discovery across the entire software development lifecycle. The directory distinguishes itself by providing a structured index of resources categorized by technical domain, ranging from foundational development utilities to specialized engineering fields. It covers high-level capabilities including artificial intelligence, data science, web

grpcui is a browser-based interactive web interface and API client for executing remote procedure calls to gRPC servers. It functions as an HTTP to gRPC gateway that translates JSON payloads into binary protobuf messages, allowing users to trigger network requests and inspect responses through a visual web interface. The tool provides schema browsing and discovery capabilities by querying server reflection or loading local protobuf descriptor files to identify available services and method signatures. It uses these definitions to automatically generate dynamic input forms for constructing req

This project is an asynchronous network framework for Python that provides both a client and a server for HTTP communication. It is designed to handle high-concurrency network operations by leveraging cooperative multitasking, allowing for the management of thousands of simultaneous connections without the overhead of traditional thread-per-request models. The framework distinguishes itself through its focus on efficient resource management and persistent communication. It utilizes connection pooling to reuse network sockets, which reduces latency during sequential requests, and supports full

This project is a community-curated directory of open-source software designed for deployment in private server environments and home labs. It serves as a comprehensive resource for discovering independent, self-hosted alternatives to mainstream cloud services, enabling users to maintain full data ownership and control over their digital infrastructure. The directory is structured through a hierarchical taxonomy that organizes a vast collection of applications into logical categories, ranging from media management and data analytics to private communication and team productivity tools. It dis

Yaak is a cross-platform desktop client and command-line utility designed for developing, testing, and debugging API endpoints. It supports multi-protocol request execution for REST, GraphQL, and gRPC services, providing a unified environment for managing network interactions, authentication credentials, and automated testing workflows. The tool distinguishes itself through a local-first architecture that stores all workspace configurations and request definitions directly on the filesystem. This design enables native integration with version control systems like Git, allowing teams to track